Enhanced pedestal pressure and parameter-linkages determining edge pedestal 
structure in JT-60U Type I and Type II ELMy H-mode

Kamada, Y.; Takenaga, H.; Urano, H.; Takizuka, T.; Hatae, T.; Miura, Y.

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Enhanced pedestal pressure and parameter-linkages determining edge pedestal structure in JT-60U Type I and Type II ELMy H-mode

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Urano, H.
Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society;
Tokamak: Edge and Divertor Physics (E2), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Kamada, Y., Takenaga, H., Urano, H., Takizuka, T., Hatae, T., & Miura, Y. (2003). Enhanced pedestal pressure and parameter-linkages determining edge pedestal structure in JT-60U Type I and Type II ELMy H-mode. In Fusion Energy 2002. Vienna: International Atomic Energy Agency.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-3CFB-C

Abstract

Based on the expanded H-mode operational regimes in JT-60U utilizing the improved capability of
high triangularity (δ) operation, the multiple pellet injection and high power heating including the negative ion
based NB (NNB), we have clarified the pedestal parameter-linkages determining the pedestal structure (i.e. 'The
pedestal width' increases with ρ_pi and does not depend on β_p-ped. 'The normalized pressure gradient α' is almost
constant at low δ , while α ∝β_p at high δ). Based on these results, we have enhanced the pedestal pressure of the
ELMy H-mode by factors of 2-2.5 at the same plasma current and plasma shape, and extended the high
confinement regime to a high density. We have found that the pedestal stored energy W_ped increases with the core
energy (or β_p-core) at high δ (>0.3-0.4), while W_ped is low and almost constant independent of, for example,
heating power at low δ (<0.2). In addition, we have expanded the type II (grassy) ELMy high confinement
regime with a small heat load on to divertor plates to the low-q (q₉₅<4) regime, and demonstrated successful
compatibility of the type II ELMs with the pellet injection. Based on a variety of JT-60U experiments, possible
linkages among the pedestal and the core parameters has been proposed.